Know all about Chalk and Appinite properties here. All properties of rocks are important as they define the type of rock and its application. Chalk belongs to Sedimentary Rocks while Appinite belongs to Igneous Rocks.Texture of Chalk is Clastic or Non-Clastic whereas that of Appinite is Porphyritic. Chalk appears Soft and Appinite appears Dull, Banded and Foilated. The luster of Chalk is dull while that of Appinite is subvitreous to dull. Chalk is available in grey, white, yellow colors whereas Appinite is available in black, bluish - grey, brown, dark greenish - grey, green, grey colors. The commercial uses of Chalk are alumina refineries, creating artwork, drawing on blackboards, gymnasts, athletes and mountain climbers use for grip, in aquifers, paper industry, production of lime, raw material for manufacture of quicklime, slaked lime, soil conditioner, whiting, whiting material in toothpaste, paint and paper and that of Appinite are an oil and gas reservoir, as a feed additive for livestock, gemstone, metallurgical flux, production of lime, soil conditioner.